Wavefunction/eigenfunction and eigen states?

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Discussion Overview

The discussion revolves around clarifying the concepts of wavefunctions, eigenfunctions, eigenstates, operators, and eigenvalues in quantum mechanics. Participants seek to understand the distinctions and relationships between these terms, which are fundamental in quantum theory.

Discussion Character

  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • Some participants propose that the wavefunction represents a probability amplitude distribution for a particle, while an eigenfunction specifically solves the time-independent Schrödinger's equation.
  • It is noted that a wavefunction may not necessarily be an eigenfunction of the Hamiltonian, as it could be a superposition of multiple eigenfunctions.
  • Some participants suggest that an eigenstate is similar to an eigenfunction but is a more general term that may include entities like spinors.
  • There is a discussion about operators having associated eigenvalues, with an example given of the momentum operator, which may have discrete or continuous eigenvalues depending on the problem setup.

Areas of Agreement / Disagreement

Participants generally agree on the definitions and relationships between wavefunctions, eigenfunctions, eigenstates, operators, and eigenvalues, but there is no consensus on the need for further clarification or foundational review of quantum mechanics.

Contextual Notes

Some participants express a need for basic quantum mechanics references, indicating potential gaps in foundational understanding that may affect the discussion.

Who May Find This Useful

This discussion may be useful for individuals seeking clarification on fundamental concepts in quantum mechanics, particularly students or those new to the subject.

new_986
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Hi everybody...
I have two questions about what I couldn't understand in quantum physics:

1- could anyone tell me please what is different between wavefunctions, eigenfunctions and eigen states?

2- what is different between Operator and eigenvalue?

thanks a lot
 
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It seems you should review some basic QM.

1) The wavefunction of a particle is a probability amplitude distribution for that particle. An Eigenfunction is a specific function which solves the time-independent Schrödinger's equation. In general, a wavefunction may not be an eigenfunction of the Hamiltonian; it could be a superposition of eigenfunctions. An eigenstate is similar to an eigenfunction, except it may not be a "function" per say. It could be like a spinor or something else. Eigenstate is a more general term.

2) Any operator has a set of eigenvalues associated with it. For example, the momentum operator p may have a discrete or continuous set of eigenvalues associated with it depending on the set up of the problem. The operator is p, the eigenvalues are what values you may find upon measuring p.
 
Matterwave said:
It seems you should review some basic QM.

1) The wavefunction of a particle is a probability amplitude distribution for that particle. An Eigenfunction is a specific function which solves the time-independent Schrödinger's equation. In general, a wavefunction may not be an eigenfunction of the Hamiltonian; it could be a superposition of eigenfunctions. An eigenstate is similar to an eigenfunction, except it may not be a "function" per say. It could be like a spinor or something else. Eigenstate is a more general term.

2) Any operator has a set of eigenvalues associated with it. For example, the momentum operator p may have a discrete or continuous set of eigenvalues associated with it depending on the set up of the problem. The operator is p, the eigenvalues are what values you may find upon measuring p.

Thanks Dear Matterwave, could you please recommend me a reference what explain the basics of QM? I'm sorry if I bother you...
 
I recommend Griffith's Introduction to Quantum Mechanics.
 

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